发明人罗永刚,冯建国,钱学锋. "Method for the Synthesis of 2-(2,4-dichloro-6,7-dihydropyrimido[5,4-b][1,4]oxazin-8-yl)ethyl methanesulfonate" [P]. 中国发明专利, 专利号 CN 112450143 B, 授权公告日 2018-10-16.
发明人韩伟,徐明华,林芳. "A Process for Preparing High-Purity 2-(2,4-dichloro-6,7-dihydropyrimido[5,4-b][1,4]oxazin-8-yl)ethyl methanesulfonate" [P]. 中国发明专利, 专利号 CN 114836881 A, 授权公告日 2018-08-06.
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